TW201227007A - Light-diffusing polarizing plate and liquid crystal display device - Google Patents

Abstract

Provided is a light-diffusing polarizing plate wherein a surface-treated film that has various functions is laminated on a light diffusion layer of a light diffusion film with an adhesive layer interposed therebetween. The light-diffusing polarizing plate is suppressed in inclusion of air bubbles in surface recesses and projections of the light diffusion layer even in cases where the light diffusion layer has a large surface roughness, and thus the light-diffusing polarizing plate is not susceptible to decoloration and has good visibility. Also provided is a liquid crystal display device which uses the light-diffusing polarizing plate. The light-diffusing polarizing plate comprises a polarizing film (101), a light diffusion film (102) that is arranged on the polarizing film (101), and a surface-treated film (103) that is arranged on the light diffusion film (102). The light diffusion film (102) has a light diffusion layer (106) that has a surface with a center line average surface roughness Ra of 0.1 [mu]m or more but less than 1 [mu]m, and the light diffusion layer (106) and the surface-treated film (103) are bonded with each other with an adhesive layer (104) interposed therebetween, said adhesive layer (104) having a storage modulus at 25 DEG C of less than 1.0 106 Pa. The liquid crystal display device uses this light-diffusing polarizing plate.

Description

201227007 SUMMARY OF THE INVENTION [Technical Field] The present invention relates to a light diffusing polarizing plate (light_diffuSing polarizing plate) and a liquid crystal display device using the same. [Prior Art] In recent years, the use of liquid crystal display devices in mobile phones, computer screens, televisions, liquid crystal projectors, and the like has been rapidly expanding. In general, the liquid crystal display device includes a backlight device and a liquid crystal panel including a liquid crystal cell, a back side polarizing plate disposed on the backlight side of the liquid crystal cell, and a front side polarizing plate disposed on the viewing side of the liquid crystal cell. Previously, it was pointed out that there is a problem in the liquid crystal display device that high contrast cannot be obtained when the display screen is observed from the squint direction, and further, the grayscale inversion phenomenon due to the inversion of the brightness of the image (gradati〇n inversion phenomenon) Etc., and it is impossible to obtain good display characteristics 荨 'that is, the viewing angle is narrow. As a method for solving the problem of the viewing angle characteristic, a technique of imparting a light diffusing function to the front side polarizing plate has been known. For example, in Japanese Patent Laid-Open Publication No. 2009-301014 (Patent Document 1) and Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. A diffusing polarizing plate (referred to as a "second light diffusing layer" in Patent Documents 1 and 2). The second light diffusing layer includes, for example, a polarizing plate and a relatively large amount of filler on the front side of the polarizing plate. A resin layer (light diffusion layer) to which a light diffusing function is imparted (light diffusing agent) 〇 159068.doc 201227007 [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent Laid-Open No. 2009-301014 [Patent Document 2] Japanese Laid-Open Patent Publication No. 2010-160527 [Draft of the Invention] [Problems to be Solved by the Invention] On the other hand, in order to further improve the visibility of a liquid crystal display device, it is sometimes the most liquid crystal display device. The surface, that is, the outermost surface of the front side polarizing plate is subjected to anti-glare treatment for preventing or reducing external light from being incident on the display surface, or anti-reflection for preventing or reducing reflection of light incident to the display surface. deal with Optical processing. However, as described in the above-mentioned Patent Document 1, the light diffusion layer containing a relatively large amount of filler as in the light diffusion layer included in the front side polarizing plate is formed to have a large protrusion "in terms of the center line average roughness Ra according to JIS B 0601. In some cases, the surface roughness may be 〇·1 μηι or more. In this case, it may be difficult to directly perform the optical treatment as described above on the surface of the light diffusion layer or even if optical processing can be directly performed by itself. Good performance of specific functions such as anti-glare or anti-reflection. In addition, it is also considered that a surface treatment film which is subjected to optical treatment on the surface of a resin film which is a substrate is bonded to the light diffusion layer by using an adhesive to impart a specific function such as an anti-glare function or an anti-reflection function, but When the surface roughness of the light-diffusing layer is 〇. 1 μιη or more, the bubbles are mixed into the surface unevenness of the light-diffusing layer at the time of bonding. When applied to a liquid crystal display device, it is generated in the display surface. Point-like eclipse and loss of visibility 159068.doc 201227007 shape. Accordingly, an object of the present invention is to provide a light diffusing polarizing plate and a liquid crystal display device using the same, which exhibits an anti-glare function or an anti-glare function on a light-diffusing layer of a light-diffusing film via an adhesive layer. In the case where the surface roughness of the light-diffusing layer is larger than 1.1 μπι or more, the bubble is prevented from being mixed into the surface unevenness of the light-diffusing layer, resulting in difficulty in generation. It is eclipsed and has good visibility. [Means for Solving the Problems] The present invention provides a light diffusing polarizing plate comprising a polarizing film, a light diffusing film laminated on the polarizing film, and a surface treating film laminated on the light diffusing film, and the light The diffusing film includes a light-diffusing layer having a center line average roughness Ra of 0.1 μπι or more and a surface of the surface of the diffusing film. The surface-treated film is a transparent resin film which is optically treated on one surface, and a light diffusing layer of the light diffusing film and The surface treatment film is bonded to each other via an adhesive layer having a storage elastic modulus at 25 ° C which is less than ιοΜοβ pa. The storage elastic modulus of the adhesive layer at 25t is preferably i 〇χ丨〇 5 pa or more. In the light-diffusing polarizing plate of the present invention, it is preferable that the light-diffusing layer and the surface of the surface-treated film opposite to the surface on which the optical treatment is applied are bonded to each other via the above-mentioned adhesive layer. The surface treatment film may be, for example, an anti-glare film which is subjected to anti-glare treatment on one of the surfaces of the transparent resin film, or an anti-reflection film which is subjected to anti-reflection treatment on one of the surfaces of the transparent resin film. The light-diffusing film preferably includes a transparent substrate film and a light-diffusing layer s laminated on the transparent substrate 159068.doc 201227007 film, and the light-diffusing layer contains a light-transmitting resin and is dispersed in the light-transmitting resin. Among the light-transmitting particles. The light-diffusing layer of the light-diffusing film can be formed by applying a resin liquid in which light-transmitting fine particles are dispersed to a transparent base film. The x' light-diffusing layer may be formed by applying a resin liquid in which the light-transmitting fine particles are dispersed on the transparent base film, and then transferring the mirror surface or the uneven surface of the mold to the surface of the layer containing the resin liquid. Moreover, the present invention provides a liquid crystal display device in which a backlight device, a light diffusing mechanism, a moonlight side polarizing plate, a liquid crystal cell, and the above light diffusing polarizing plate are sequentially laminated. In the liquid crystal display device of the present invention, the light diffusing polarizing plate is disposed such that the polarizing film side faces the liquid crystal cell. In the liquid crystal display device of the present invention, it is preferable that the light emitted from the light diffusing means is inclined by 7 Å from the normal direction of the light incident surface of the liquid crystal cell. The π degree in the direction of the normal direction is 2% by mass or less with respect to the luminance in the normal direction, and includes non-parallel light. The light diffusing means may be a light diffusing plate on the side of the backlight device and a light deflecting plate on the opposite side of the light diffusing plate as the liquid crystal cell. A TN (Twisted Nematic) method may be used. Liquid crystal cell, IPS (In_piane Switching) method liquid aa unit or VA (Vertical Alignment) liquid crystal cell. [Effects of the Invention] According to the present invention, it is possible to provide a light diffusing polarizing plate and a liquid crystal display device using the same, which is laminated on a light diffusion layer of a light diffusing film via an adhesive layer. In the film, the bubble was prevented from being mixed into the surface unevenness of the light diffusion layer of 159068.doc 201227007, and as a result, it was difficult to cause color loss and the visibility was good. [Embodiment] <Light diffusing polarizing plate> Fig. 1 is a schematic cross-sectional view showing a preferred example of the light diffusing polarizing plate of the present invention. The light diffusing polarizing plate 10A shown in the drawing of the present invention comprises a polarizing film 101, a light diffusing film 102 laminated on the polarizing film 101, and a surface treating film 103 laminated on the light diffusing film 102. The light diffusion film 1〇2 includes a light diffusion layer 106. The surface treatment film 1〇3 includes a transparent resin film 1〇7 which is optically treated (specifically, the surface treatment layer 108 is provided) on one surface. The light diffusion layer 1 〇 6 of the light diffusion film 102 and the surface treatment film 1 〇 3 are bonded to each other via the adhesive layer 1 〇 4 . In the light diffusing polarizing plate 1 shown in FIG. 1, the light diffusing film i 02 includes a transparent base film 105, and a light diffusing layer 106 laminated on the transparent base film 1〇5, and the light diffusing layer 1 〇6 is a resin layer in which the light-transmitting fine particles 16a are dispersed in the light-transmitting resin 1〇6b. The light-diffusing film 1〇2 is laminated on the polarizing film 1〇1 such that the transparent substrate film 105 side faces the polarizing film 1〇1. In the light-diffusion film 102, the surface roughness average Ra of the surface of the light-diffusion layer 1〇6 according to JIS B 〇6〇1 is H μηι or more and less than 1 μπι. The surface treatment film 103 contains a transparent resin film 1 7. A surface treatment layer 1 8 which is laminated on the surface of one of the transparent resin films 107. The surface treatment film 1〇3 is bonded to the surface of the transparent resin film 1〇7 opposite to the surface treatment layer 108 via the adhesive layer 104 (the surface of the surface treatment film 〇3 which is not subjected to optical treatment) The light diffusion layer 102 of the light diffusion film 102 is on the light diffusion layer 1 . 159068.doc 201227007 Further, the 'protective film 109 is used to protect the film on the other surface of the polarizing film ιοί' is not necessarily required, and may be omitted. Further, a protective film 109 such as an optical compensation film such as a retardation film (phase difference plate) may be bonded. According to the light diffusing polarizing plate of the present invention having the above configuration, the light diffusing layer 丨〇6 of the light diffusing film 102 and the surface treating film 1〇3 formed by forming the surface treated layer 108 on the transparent resin film 1〇7 Is via 25. (The storage elastic modulus of the lower layer is relatively small to be adhered to the adhesive layer 1〇4 of the i.OxiO6 Pa, so that even the center line average roughness Ra of the surface of the light diffusion layer 106 is 0 gt; 1 μηι In the above case, it is also possible to suppress the incorporation of air bubbles between the surface unevenness of the light-diffusing layer ι 6 and the adhesive layer 104, and as a result, it is difficult to produce a dot-like color loss when applied to a liquid crystal display device, and good visibility can be obtained. Further, since the light-diffusing layer 106 and the surface-treated film 1〇3 can be bonded to each other with good adhesion, the durability of the light-diffusing polarizing plate can be improved. Further, the bonding of the surface-treated film 103 using the adhesive layer can be confirmed. The surface treatment film 103 having a desired optical function is laminated on the light diffusion layer 1〇6 while completely eliminating the influence of the surface shape of the light diffusion layer 106 on the structure and shape of the surface treatment layer 108. Therefore, the light diffusing polarizing plate of the present invention is a function of exhibiting a light diffusing function well and a specific optical function obtained by the surface treating layer 108. Hereinafter, the light diffusing polarizing plate of the present invention will be described in more detail. (Polarizing film) As the polarizing film 101, for example, a dichroic dye (dichr〇ic 159068.doc 201227007 dye) or iodine is adsorbed and contained to include a polyvinyl alcohol resin, a polyvinyl acetate resin, and ethylene. a film of a vinyl acetate (EVA) resin, a polyamide resin, a polyg-type resin, or the like, or a molecularly oriented polyvinyl alcohol film containing one of the ethyl alcohols and a color dehydration product. (dichroic dehydration product) (polyethylene) is a molecular chain of polyvinyl alcohol / polyethylene copolymer, etc. In particular, 'the dichroic dye or iodine is adsorbed to uniaxial drawing The polyvinyl alcohol-based resin film is preferably used as a polarizing film. The thickness of the polarizing film 101 is not particularly limited, and is preferably 10 Å or less from the viewpoint of thinning of the light diffusing polarizing plate and the like. More preferably, it is preferably 10 to 50 μm, and more preferably 25 to 3 5 μm. (Light diffusion film) As shown in FIG. 1, the light diffusion film used in the present invention preferably comprises a transparent substrate film 105, And a light diffusion layer ι6 layer laminated on the transparent substrate film 105 In addition, the light-diffusing layer 106 is preferably a resin layer in which the light-transmitting fine particles (light-diffusing agent) 106a is dispersed in the light-transmitting resin 1''. The transparent base film 105' is optically transparent. There is no particular limitation. For example, a glass or a plastic film can be used. As the plastic film, it is preferred to have moderate transparency and mechanical strength, and specific examples thereof include cellulose acetate resin such as TAC (diethyl cellulose). A polyester resin such as an acrylic resin, a polycarbonate resin or polyethylene terephthalate, etc. The thickness of the transparent base film 105 is, for example, 1 〇 to 5 〇〇 μ η, preferably 2 〇 〜 3〇〇μιη. The light-diffusing layer 106 is formed by dispersing the light-transmitting fine particles 1〇6a in the light-transmitting resin 100b as the base layer of the light-transmitting resin i〇6b. The translucent resin 106b is not particularly limited as long as it has translucency. For example, 159068.doc 201227007 can be used as a cured product of an ionizing radiation curable resin such as an ultraviolet curable resin or an electron beam curable resin; a cured product of a hardened resin; a thermoplastic resin; and a cured product of a metal alkoxide. Among them, a cured product of an ionizing radiation-curable resin is preferred in terms of imparting high hardness and scratch resistance. When the ionizing radiation-curable resin is used, the resin is cured by irradiation with ionizing radiation to form a light-transmitting resin 106b. When a thermosetting resin or a metal alkoxide is used, the resin is cured by heating to form a light-transmitting resin 丨06b. Examples of the ionizing radiation-curable resin include polyfunctional acrylates such as polyacrylic acid acrylic acid or mercapto acrylate, and polyisocyanates and polyhydric alcohols, and hydroxy esters of acrylic acid or mercaptoacrylic acid. Functional acrylamide phthalate and the like. In addition, as the ionizing radiation curable resin, a polyether resin having an acrylate functional group, a polyester resin, an epoxy resin, an alkyd resin, a acetal resin, and a polybutylene may be used. An olefin resin, a polythiol polyene resin, or the like. Examples of the thermosetting resin include a phenol resin, a urea melamine resin, an epoxy resin, and an unsaturated polyester resin, in addition to a thermosetting urethane resin containing an acrylic polyol and an isocyanate prepolymer. And polyoxyl resin. Examples of the thermoplastic resin include cellulose derivatives such as acetam cellulose, nitrocellulose, acetyl butyl cellulose, ethyl cellulose, & fluorenyl cellulose, vinyl acetate and copolymers thereof, and ethylene ethylene. And copolymers thereof, vinyl resins such as vinylidene dioxide and copolymers thereof, acetal resins such as polyvinyl acetal and polyvinyl butyral, acrylic resins and copolymers thereof, 159068.doc 201227007 and An acrylic resin such as a methacrylic resin or a copolymer thereof, a polystyrene resin, a polyamide resin, a polyester resin, a polycarbonate resin, or the like. As the metal alkoxide, a cerium oxide-based substrate or the like having a decane oxide-based material as a raw material can be used. Specifically, it is tetramethoxy decane, tetraethoxy decane or the like, and can be formed into an inorganic or organic inorganic composite matrix (translucent resin) by hydrolysis or dehydration condensation. Further, as the light-transmitting fine particles 1 〇 6a, a light diffusing agent containing light-transmitting organic fine particles or inorganic fine particles can be used. For example, organic fine particles including an acrylic resin, a melamine resin, polyethylene, polystyrene, an organic polyoxynoxy resin, and an acrylic-styrene copolymer, or calcium carbonate, ceria, alumina, and cesium carbonate may be mentioned. Inorganic fine particles such as barium sulfate, titanium oxide, and glass. Further, a balloon of an organic polymer or a glass bead may be used. The light-transmitting fine particles 〇6a may contain one type of fine particles or may contain two or more kinds of fine particles. The shape of the light-transmitting fine particles 16a may be a spherical shape, a flat shape, a plate shape, a needle shape, or an amorphous shape, and is preferably spherical or slightly spherical. Translucent particles! The weight averse diameter of 06a is preferably 〇 5 to 15 μηη, more preferably 4 to 8 μηη. When the weight average particle diameter of the light-transmitting fine particles 106a is less than 55 μm, the light diffusibility of the light-diffusing film ι 2 is insufficient, and as a result, when the light-diffusing polarizing plate is applied to a liquid crystal display device, It is not possible to obtain a sufficient wide viewing angle performance. Further, when the weight average particle diameter exceeds 15 μηΐ2, sufficient light diffusibility cannot be obtained. X, the light-transmitting fine particles 1G6a are preferably particles 159068.doc 201227007 The ratio of the standard deviation of the diameter to the weight average particle diameter (standard deviation / weight average particle diameter) is 0.5 or less, more preferably 〇.4 or less. When the ratio exceeds 0.5, the thickness of the surface of the light-diffusing layer 106 is 1 μm or more, or the surface of the light-diffusing film 102, as the light-transmitting fine particles are included in the particle size. The haze is out of the preferred range described below. The standard deviation of the weight average particle diameter and the particle diameter of the light-transmitting fine particles 16A is measured by using a Coulter particle counter (manufactured by Beckman Coulter Co., Ltd.) based on the Coulter principle (fine pore resistance method). The content of the light-transmitting fine particles i〇6a is preferably 20 parts by weight or more and 1 part by weight or less, more preferably 20 parts by weight or more and 70 parts by weight based on 100 parts by weight of the light-transmitting resin 106b. Hereinafter, it is preferably 25 parts by weight or more and 60 parts by weight or less, and more preferably 25 parts by weight or more and 50 parts by weight or less. When the content of the light-transmitting fine particles 1〇6& is less than 20 parts by weight based on 100 parts by weight of the light-transmitting resin, the light diffusibility of the light-diffusing film 102 becomes insufficient, and as a result, the light diffusing polarizing plate is applied. In the case of a liquid crystal display device, it is difficult to obtain a sufficient wide viewing angle performance. Further, the content of the light-transmitting fine particles 106a is relative to the light-transmitting resin! When the weight fraction exceeds the weight of the crucible, the haze of the light diffusion film 102 becomes too large, and as a result, the transparency of the light diffusion film 1〇2 is lowered, and when the light diffusing polarizing plate is applied to the liquid crystal display device, the front side is caused. The contrast is reduced. According to the present invention, since the surface treatment film 103 and the light diffusion layer 1〇6 are bonded via the adhesive layer 104, even if a relatively large amount of light-transmitting fine particles (light diffusing agent) is contained in the light diffusion layer. At the same time, it can also suppress the incorporation of air bubbles to suppress the generation of color loss, and it can be surely and easily, and does not damage the light that makes the surface treatment layer behave in a specific way. l5906S.doc •12-

S 201227007 The surface treatment layer is imparted to the light diffusing polarizing plate with a structure or shape that is necessary for the function. The difference in refractive index between the light-transmitting fine particles 106a and the light-transmitting resin 106b is preferably from 0.04 to 0.15 mj. When the refractive index difference between the light-transmitting fine particles and the light-transmitting resin 6b is not within the above range, moderate internal scattering due to the refractive index difference can be generated to obtain a light diffusing film having a moderately high light diffusibility. The surface of the light-diffusing layer 106 (the surface on the opposite side to the transparent base film 1〇5) is preferably formed only of the light-transmitting resin 106b. That is, the light-transmitting fine particles 106a are preferably not buried in the surface of the light-diffusing layer ι6 and are completely buried in the light-diffusing layer 106. Therefore, the thickness of the light-diffusing layer 1〇6 is preferably 1 time or more and 3 times or less the weight average particle diameter with respect to the light-transmitting fine particles 106a. When the thickness of the light-diffusing layer 106 is less than one times the weight average particle diameter of the light-transmitting fine particles 1〇6a, when the light-diffusing polarizing plate is applied to a liquid crystal display device, the surface of the light-diffusing layer is generated. Diffuse reflection and the feeling of "whitening" in the entire white surface. Further, the term "whitening" refers to a phenomenon in which the surface of the screen of the liquid crystal display device appears white, and is a phenomenon which is particularly likely to occur in a bright place. When the thickness of the light-diffusing layer 106 exceeds three times the weight average particle diameter of the light-transmitting fine particles 106a, the thickness of the light-diffusing layer 106 becomes too large, and the light diffusing property of the light-diffusing film 102 becomes light. As a result, when the light diffusing polarizing plate is applied to a liquid crystal display device, there is a case where the front contrast is lowered. The thickness of the light diffusion layer 106 is preferably in the range of 1 to 30 μm. In the light diffusion layer 159068.doc -13· 201227007 106 thickness is not up! In the case of μιη, there is a case where sufficient scratch resistance which is required for the light diffusion film disposed on the viewing side surface of the liquid crystal display device cannot be imparted. Further, when the thickness exceeds 3 〇 μϊη, the amount of curl generated in the produced light-diffusing film becomes large, and the workability in the manufacturing process of the light-diffusing polarizing plate may be lowered. The surface of the light-diffusing layer 106 (the surface opposite to the transparent substrate film 1〇5) has a center line average roughness according to JIS β 0601 of 〇ι μιη or more and less than 1 μϊη, preferably 〇· 2 μηι Above and not up to 5 μϊη. The average roughness of the center line of the surface of the light diffusion layer 106! When the case is above 1 μΓη, the whitening becomes apparent. According to the present invention, even if the center line average roughness Ra is 0·1 μϊη or more and further 〇.2 μπι or more, it is difficult to cause a problem of color loss caused by air bubble mixing, and a surface treatment layer exhibiting good optical function can be obtained. It is imparted to a light diffusing polarizing plate. The center line average roughness Ra ' according to JIS Β 0601 means that only the standard length 1 (Ear) is extracted from the roughness curve in the direction of the average line, and the direction of the average line of the extracted portion is taken as the X-axis and the longitudinal direction. When the direction of the magnification is the y-axis and the roughness curve is represented by Y=f(x), the value obtained by the following formula (〇 is expressed in units of micrometers (μϊη). [Number 1]

Ra = — Γ {f(x)}dx (l) The average roughness Ra of the centerline of the IJ〇 can be used with a conjugated focal interference microscope (c〇nf〇cal interference microscope) based on ns 601 0601 (eg, Optical Solution Co., Ltd.) The "PLp2300" manufactured is calculated based on the above formula (1) using a program software that can calculate Ra.

159068.doc • 14-S 201227007 The light diffusing film 102 preferably has a total haze of 40% or more and 70% or less and an internal haze of 40% or more and 70% or less. Further, the surface haze resulting from the surface shape of the light diffusion layer 106 is preferably less than 6%. The "total haze" is the total light transmittance (Tt) according to the total amount of light that is transmitted through the light diffusing film, and the diffused light transmittance which is diffused and penetrated by the light diffusing film. The ratio of (Td) is obtained by the following formula (2): total haze (°/〇) = (Td/Tt) xl00 (2). The total light transmittance (Tt) is the sum of the parallel light transmittance (Tp) and the diffused light transmittance (Td) transmitted in a state coaxial with the incident light. The total light transmittance (Tt) and the diffused light transmittance (Td) are values measured in accordance with JIS κ 7361. The term "door degree" refers to a haze other than the haze (surface haze) caused by the surface shape of the light diffusion layer 106 in the total haze. When the total haze and/or the internal haze is less than 4%, the light scattering property is insufficient. It is difficult to obtain a sufficient wide viewing angle performance. Further, when the total haze and/or the internal haze exceeds 70%, the light scattering becomes strong, and when the light diffusing polarizing plate is applied to the liquid crystal display, the front contrast is lower. Further, in the case where the total haze and/or the internal haze exceeds 70%, the transparency of the light-diffusing film 1 〇 2 tends to be biased. The total haze and the internal prayer degree are preferably 50% or more and 65 〇/〇 or less. Further, when it is caused by the light diffusion layer 1 〇 6 or more, the surface haze of the surface is 6%, and the blushing tends to occur due to the surface 戌 reflection 159068.doc -15· 201227007. In order to prevent blushing more effectively, the surface haze is preferably 3% or less. Specifically, the total haze, internal haze and surface haze of the light diffusing film 102 are measured as follows. In other words, first, in order to prevent warpage of the film, an optically transparent adhesive is used, and the transparent substrate film 1〇5 side of the light diffusion film 102 is bonded to the glass substrate so that the light diffusion layer 106 becomes a surface. The sample was used to measure the total haze value for the sample for measurement. The total haze value is determined by using a haze penetration meter according to JIS K 7136 (for example, a haze meter "HM-150" manufactured by Murakami Color Technology Co., Ltd.) to measure total light transmittance (Tt) and diffusion. The light transmittance (Td) is calculated from the above formula (2). Then, a triethylene glycol film having a haze of approximately 〇% was attached to the surface of the light-diffusing layer 106 by using glycerin, and the haze was measured in the same manner as the above measurement of the total haze. Since the surface haze due to the surface shape of the light-diffusing layer 106 is substantially canceled by the bonded triacetyl cellulose film, the haze can be regarded as the "internal haze" of the light-diffusing film 102. Therefore, the "surface haze" of the light-diffusing film 102 can be obtained by the following formula (3): surface haze (%) = total haze (%) - internal haze (%) (3). Further, the light diffusion film 102 may include other layers (including an adhesive layer) between the transparent substrate film 1〇5 and the light diffusion layer 106. Next, a method for manufacturing the light diffusion film 102 will be described. The light diffusion film 102 can be formed by applying a resin liquid in which the light-transmitting fine particles i 6a are dispersed on the transparent base film 105. The resin liquid contains light-transmitting fine particles 106a and constitutes a light-diffusing layer 1 〇6 159068.doc

S 201227007 The translucent resin 1 〇 6b or a resin forming the same (for example, an ionizing radiation-curable resin, a thermosetting resin or a metal alkoxide), and other components such as a solvent as needed. In the case where an ultraviolet curable resin is used as the resin for forming the light-transmitting resin 106b, the above resin liquid contains a photopolymerization initiator (radical polymerization initiator). As the photopolymerization initiator, for example, an acetophenone-based photopolymerization initiator, a benzoin-based photopolymerization initiator, a benzophenone-based photopolymerization initiator, and a 9-oxo-sulfur P-p-series photopolymerization can be used. An initiator, a tri-β-well photopolymerization initiator, and an oxadiazole-based photopolymerization initiator. Further, as a photopolymerization initiator, for example, 2,4,6-trimethylphenyl fluorenyl diphenylphosphine oxide or 2,2'-bis(o-chlorophenyl)-4,4' may be used. 5,5'-tetraphenyl- l,2,-Limi 0 sitting, 10-butyl-2-气. Bite ketone, 2-ethyl 蒽g Kun, benzoin, 9, 〇 〇 菲, camphor, phenyl glyoxylate, and titanocene compounds. The amount of the photopolymerization initiator to be used is usually 0.5 to 20 parts by weight, preferably id parts by weight, based on 1 part by weight of the resin contained in the resin liquid. Further, in order to make the optical characteristics and surface shape of the light-diffusing film 102 uniform, the dispersion of the light-transmitting fine particles 106a in the resin solution is preferably dispersed in an isotropic manner. The coating of the above resin liquid on the transparent substrate film 1 〇 5 can be performed, for example, by a gravure coating method, a micro gravure coating method, or a bar coating method. 〇d (3) state method), knife coating method, air knife coating method, kiss c〇ating method, die coating method ) and so on. When the resin liquid is applied, it is preferable that the thickness of the light-diffusing layer 1〇6 is i times or more and three times the thickness of the light-transmitting fine particles 106a as described above, and 159068.doc •17-201227007 The coating film thickness was adjusted in the following manner. In order to improve the applicability of the resin liquid or to improve the adhesion to the light-diffusing layer 1〇6, various surface treatments may be performed on the surface (light-diffusion layer side surface) of the transparent substrate film 1〇5. Examples of the surface treatment include corona discharge treatment, glow discharge treatment, acid surface treatment, alkali surface treatment, and ultraviolet irradiation treatment. Further, for example, a primer may be formed on the transparent substrate film 1〇5. Another layer such as a layer (easily adhesive layer) is applied to the other layer. Further, in order to improve the adhesion between the transparent base film 105 and the polarizing film 1〇1, it is preferable to carry out the surface treatment as described above on the surface of the transparent base film 105 opposite to the light diffusion layer 106. The light-diffusing film 102 can also be applied to the transparent substrate film 1〇5 by applying a resin liquid in which the light-transmitting fine particles 1〇6a are dispersed, and then the mirror surface or the uneven surface of the mold can be transferred to the surface of the layer containing the resin liquid. Formed by the method. That is, the light diffusion layer 106 having the above-described medium-to-line average roughness Ra may be obtained by applying the above-mentioned resin liquid, and if necessary, the mirror surface of the mirror-shaped mold (mirror mold) or the mold having the uneven surface (pressure) The uneven surface of the patterning mold is formed by adhering to the surface of the layer containing the resin liquid to transfer a mirror surface or a concave-convex surface. The mirror mold can be a mirror metal roll, and the embossing mold can be made of metal for embossing. When an ionizing radiation-curable resin, a thermosetting resin, or a metal alkoxide is used as the resin for forming the light-transmitting resin (7), a layer containing the resin liquid is formed, and drying is performed as needed (solvent removal), and Irradiation by ionizing radiation in a state in which the mirror surface or the uneven surface of the mold is adhered to the surface of the layer containing the resin liquid as needed, so that the irradiation is performed by ionizing radiation (making 159068.doc

S 18 - 201227007 The layer containing the resin liquid is hardened by the case of ionizing radiation-curable resin or by heating (in the case of using a thermosetting tree or a metal oxide). The ionizing radiation ' can be appropriately selected from ultraviolet rays, electron beams, near ultraviolet rays, visible light, near infrared rays, infrared rays, and X rays according to the kind of the resin contained in the resin liquid. Among these, ultraviolet rays are preferable. And an electron beam, especially in terms of ease of operation and high energy availability, it is preferably ultraviolet light. As the light source of the ultraviolet light, for example, a low pressure mercury lamp, a medium pressure mercury lamp, a south pressure mercury lamp, an ultrahigh pressure mercury lamp, a carbon fox lamp, a metallized lamp, and a gas lamp can be used. Further, an ArF excimer laser, a KrF quasi-molecular laser, an excimer lamp, or a synchrotron radiation may be used. Among these, an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a gas arc, and a metal toothed lamp can be preferably used. Further, examples of the electron beam 'sity include a Cockcroft-Walton type, a Van de Graaff type, a resonance transformer type, an insulation core transformation type, and a straight line. An electron beam of 50 to 1000 keV, preferably 1 〇〇 to 3 〇〇 keV, which is released in various electron beam accelerators such as a type, a Dynamitron type, and a high frequency type. Next, a preferred embodiment for fabricating the light diffusing film 102 will be described. The manufacturing method of the preferred embodiment includes: a step of continuously feeding a transparent substrate film wound in a roll shape for continuously producing the light diffusion film 102, and coating a resin liquid in which the light-transmitting fine particles 16a are dispersed a step of drying on the transparent substrate film 105 and drying as needed; a step of hardening the layer containing the resin liquid; and a step of winding up the obtained light diffusion film 1〇2. 159068.doc -19- 201227007 This manufacturing method can be implemented using, for example, the manufacturing apparatus shown in FIG. First, the transparent substrate film 105 is continuously wound up by an unwinder 301. Then, the coating device 302 and the supporting roller 303 are opposed thereto, and the resin liquid in which the light-transmitting fine particles i6a are dispersed is applied onto the rolled transparent substrate film 105. Then, when the solvent is contained in the resin liquid, it is dried by passing it through the dryer 304. Then, the transparent base film 105 provided with the layer containing the resin liquid is wound on the mirror metal roll or embossed in such a manner that the layer containing the resin liquid is in close contact with the mirror metal roll or the metal roll 305 for embossing. The metal roll 305 for processing is placed between the metal roll 305 and the nip roller 306. Thereby, the mirror surface of the mirror metal roll or the uneven surface of the metal stick is transferred to the surface of the layer containing the resin liquid. Then, the transparent base film 105 is placed in the state of the mirror metal roll or the metal roll 305 for embossing, and the transparent base film 105 is irradiated with ultraviolet rays from the ultraviolet irradiation device 308, thereby forming a layer containing the resin liquid. hardening. Since the irradiated surface is heated to a high temperature by ultraviolet irradiation, the mirror metal roll or the embossing metal roll 3〇5 preferably contains therein for cooling the surface temperature to room temperature of about 80 ° C. Device. Further, the ultraviolet irradiation device 308 can be used in one unit or in a plurality of units. The transparent base film 105 (light-diffusion film 1〇2) on which the light-diffusion layer ι 6 is formed is peeled off from the mirror-finished metal roll or the embossed metal roll 305 by the peeling roll 307. The light diffusion film 102 produced as described above is taken up on the winding device 309. At this time, in order to protect the light diffusion layer 106, a surface protective film containing polyethylene terephthalate or polyethylene may be attached to the light diffusion layer 1 through an adhesive layer having removability. Surface and take up. 159068.doc •20· 201227007 Further, it is also possible to perform additional ultraviolet irradiation after peeling off from the mirror metal roll or the embossing metal 305 by the peeling roller 3〇7. Further, the transparent base film (8) on which the layer containing the uncured resin liquid is formed may be peeled off from the mirror metal roll or the metal roll 305 for embossing, and then irradiated with a violet image to be cured to replace the roll. Ultraviolet irradiation is performed in the state of the mirror metal roll or the metal roll 305 for embossing. The light diffusion film 102 and the polarizing film 1〇1 are bonded to each other via an adhesive layer or the like. The light-diffusing film 102 also functions as a protective film of the polarizing film 1〇1, and this configuration is advantageous for thinning of the light-diffusing polarizing plate. As the adhesive, an adhesive containing an active energy ray-curable resin composition such as a curable resin composition containing an epoxy resin or a thermosetting resin composition, or a polyvinyl alcohol-based resin or an amine group can be preferably used. A formate resin is used as a water-based adhesive for an adhesive component. In addition, it is more preferable to use an adhesive containing a curable resin composition containing an epoxy resin in terms of improvement in productivity such as a drying step and obtaining good adhesion strength. The bonding of the light diffusion film 102 containing the adhesive containing the curable resin composition containing an epoxy resin to the polarizing film 101 can be carried out by applying the adhesive to the light diffusion film 102 or the polarizing film 1 The bonding surface of 1 is formed by laminating two films through an uncured adhesive layer, and then the uncured adhesive layer is cured by irradiation of an active energy ray or heating. The coating method of the subsequent agent is not particularly limited, and for example, a squeegee, a bar, a die coater, a coater, or a gravure coating can be used. Various coating methods such as a cloth coater. Since each coating method has an optimum viscosity range, it is also possible to use 159068.doc -21· 201227007 to adjust the viscosity of the adhesive using an organic solvent. The thickness of the adhesive layer after hardening is usually 0.1 to 20 μηη, preferably 〇2 to 10 μηη, and more preferably 0.5 to 5 μηη 表面 (surface treatment film). The surface treatment film 103 is one of the transparent resin films 107. A film that is optically treated on the surface. As the surface treatment film 1?3, specifically, a film for forming the surface treatment layer 108 having a desired optical function on one of the surfaces of the transparent tree 107 can be formed. As the transparent resin film, for example, a cellulose acetate resin such as TAC (triethylene glycol), an acrylic resin such as polymethyl methacrylate, a polycarbonate resin, and polyethylene terephthalate can be used. A resin film such as a polyester resin. The thickness of the transparent resin film 1〇7 is, for example, 10 to 500 μm, preferably 20 to 3 μm. Examples of the surface treatment film 1〇3 include an antiglare film including an antiglare layer as the surface treatment layer 1G8 (that is, the above-described optical treatment is an antiglare treatment), or an antireflection layer as the surface treatment layer 1Q8 (that is, the above optical Antireflection film treated as anti-reflective treatment). The term "anti-self" refers to a surface irregularity that is reduced or prevented from being reflected in a display screen by diffuse reflection of light from the surface. Further, the term "anti-reflection" refers to reducing or preventing reflections on a display screen by reducing or preventing reflection of light incident on the display pupil surface. As the anti-glare film, for example, an ultraviolet curable resin composition containing or not containing fine particles is applied onto the transparent resin film 107, and the uneven surface of the mold having a specific surface uneven shape is extruded. The ultraviolet curable resin layer is pressed against the formed m-line-hardened resin layer, and the surface of the anti-glare layer is given a specific surface unevenness. Further, it is also possible to use 159068.doc •22-201227007, which is cured by applying the composition to a transparent ray-hardening resin line-curable resin layer of transparent _(4) 7=, thereby using: The ultraviolet glare layer is allowed to impart surface irregularities caused by the fine particles. As the anti-glare film, for example, an anti-glare film containing a commercially available product can be cited. β 10_ ^ 4 3 includes a low refractive index layered layer including a material having a refractive index lower than that of the light diffusion layer 106, or a high refractive index layer having a refractive index and a material of the money layer (10), and The laminated structure of the low refractive index layer having a material lower than the material of the high refractive index layer is used as an antireflection layer or the like. The low-refractive-index layer may be, for example, a silica-containing sulphate or a sulphide-containing fine particle (LiF, MgF, 3, sequel, sequel, sputum, microparticles having a void inside (hollow sulphur dioxide, granules, etc.), gas-containing gas A low refractive index material such as a polymer or a binder resin. The binder resin forming material may also be a conventionally known one, and may be used: a hydrolyzate of polyoxan oxide, a light or a thermosetting compounding compound ( a dendritic polymer, a hyperbranched polymer, or the like, and other light or thermosetting resin. Between the transparent resin film and the low refractive index layer or the high refractive index layer, one or two or more kinds of hard coat layers or Other layers such as an antistatic layer. A commercially available antireflection film can also be used as the antireflection film. In the light diffusing polarizing plate of the present invention, the surface treatment film 1〇3 is usually warmed by the adhesive layer 104 to be transparent. The surface of the resin film 1〇7 opposite to the surface treatment layer 〇8 (the surface of the surface treatment film 103 which is not subjected to optical treatment) is bonded to the light diffusion layer 1〇6 of the light diffusion film 102. Agent layer) The adhesive layer 104 contains 25 ° C The adhesive layer β of the adhesive modulus is less than 6 159068.doc · 23· 201227007. The surface treatment film 103 is attached to the light by passing through an adhesive layer exhibiting a storage elastic modulus in the range. On the diffusion layer 1〇6, it is possible to effectively suppress the occurrence of color loss caused by the surface unevenness of the bubbles mixed into the light diffusion layer 106 and the adhesive layer ίο: if the storage elastic modulus at 25t is 1 0 1 〇Pa As described above, the bubbles are mixed into the surface unevenness of the light-diffusing layer 106 and the adhesive layer 104 at the time of bonding, and when applied to a liquid crystal display device, a dot-like color loss corresponding to the bubble is generated, and the bonding is more effectively suppressed. From the viewpoint of the mixing of the bubbles, the storage elastic modulus of the adhesive layer 1 to 4 is preferably 5. 〇 xl 〇 5 Pa or less, more preferably 3·7 χ 1 〇 5 or less. The storage elastic modulus of the adhesive layer 104 at 25 ° C is preferably 5. 〇 x l 04 Pa or more 'more preferably 丨〇 x l 〇 5 pa or more. Thereby, the outermost surface of the light diffusing polarizing plate can be ensured ( Good hardness (pencil hardness) of the surface of the surface treatment 108. If the storage modulus is not When i 〇 x 1〇5 Pa, the outermost surface may be easily dented and the hardness may not be maintained. The storage elastic modulus (dynamic elastic modulus) means the m (four) elasticity which is usually used for the measurement of viscoelasticity. At this time, the sample is given a strain or stress which changes (vibration) according to time, and the vibration stress or strain generated thereby is measured to evaluate the mechanical properties of the sample (dynamic viscoelasticity measurement). When the generated strain is divided into two components of a component having the same phase as the vibration stress and a component having a phase shift of 9 相对 with respect to the vibration stress, the component having the same phase as the vibration stress is the storage elastic modulus. The storage elastic modulus can be carried out using a commercially available viscoelasticity measuring device, for example, a dynamic viscoelasticity measuring device (Dy_ic Analyzer RDA®: manufactured by RE0METRIC Co., Ltd.) shown in the examples disclosed below, 159068.doc -24 - 201227007 Test. In the temperature control of the viscoelasticity measuring device, various known temperature control devices such as a circulating thermostat, an electric heater, and a Peltier element are used, whereby the temperature at the time of measurement can be set. Examples of the adhesive for forming the adhesive layer which exhibits the above-described storage elastic modulus include an acrylic polymer, a polyoxymethylene polymer, a polyester, a polyurethane, and a polyether as a base polymer. Adhesive. Among them, acrylic acid-based adhesives using an acrylic polymer as a base polymer are preferably used from the viewpoints of transparency, adhesion, reliability, and rew〇rkability. In the acrylic polymer, an alkyl group having an alkyl group having a carbon number of 20 or less, such as a methyl group, an ethyl group, a butyl group, and the like, and a (mercapto)acrylic acid or (fluorenyl)acrylic acid The acrylic monomer containing a functional group such as an ethyl ester is preferably an acrylic acid having a weight average molecular weight of 100,000 or more, such that the glass transition temperature is preferably 25 liters or less, more preferably ot or less. The copolymer can be used as a base polymer. The acrylic acid-based base polymer is not particularly limited, and butyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, or (meth)acrylic acid 2 can be preferably used. A (meth) acrylate-based base poly δ such as ethyl hexyl ester or a copolymerized base polymer using two or more of these (meth) acrylates. Further, a polar monomer may be copolymerized in the base polymers. Examples of the polar monomer include (meth)acrylic acid, 2-hydroxypropyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, (meth)acrylamide, and (decyl)acrylic acid. 2-Ν, Ν-dimethylaminoethyl ester, glycidyl (meth)acrylate, etc. having a carboxyl group, a hydroxyl group, a decylamino group, an amine group, an epoxy group, etc. 159068.doc -25- 201227007 Polar functional group monomer. These acrylic polymers can also be used as an adhesive alone. In the case of use as an adhesive, a crosslinking agent is usually formulated. The crosslinking agent may, for example, be a divalent or polyvalent metal ion and form a metal carboxylate I with a carboxyl group, be a polyamine compound, form a guanamine bond with a carboxyl group, or be a polycyclic 2 compound or a poly An alcohol compound which forms an ester bond with a carboxyl group, is a polyisocyanate compound, and forms an gland bond with a rebel group. For example, the parent polymer density of the base polymer is relatively low by appropriately selecting the kind or amount of the crosslinking agent, or the type of the monomer forming the base polymer is appropriately selected to make the acid value relatively small, or the base polymer is lowered. The degree of polymerization makes the content of the low molecular weight component relatively large, and the storage elastic modulus of the adhesive layer can be lowered to the above range. On the other hand, an oligomer (such as an urethane-based oligomer or the like) is blended in the adhesive composition, or the above-described adhesive composition containing an oligomer is further irradiated with an energy ray. Hardening can be used to store the elastic modulus. Therefore, in order to adjust the storage elastic modulus, the above method can also be used in combination. In order to adjust the adhesion, cohesion, viscosity, modulus of elasticity, glass transition temperature, etc. of the adhesive, in addition to the above-mentioned base polymer and cross-linking agent, it may be formulated as a natural substance or a composition as needed. A suitable additive such as a resin or an adhesive-imparting resin, an antioxidant, an ultraviolet absorber, a dye, a pigment, an antifoaming agent, an anticorrosive agent, and a photopolymerization initiator. Examples of the ultraviolet absorber include a salicylate-based compound, a dimethanone-based compound, a stupid tri-salt compound, a cyanoacrylate-based compound, and a nickel-salted salt-based compound. 159068.doc

-26·201227007 The adhesive layer can be applied to the transparent resin film 107 by a die coater, a gravure coater or the like by, for example, forming the above-mentioned adhesive into an organic solvent solution, and drying it. Method to set. Further, the adhesive layer may be transferred onto the light diffusion layer 1 〇 6 or the transparent resin film 1 〇 7 by a sheet-like indenter formed on a plastic film (referred to as a separation film) subjected to mold release treatment. Method to set. The thickness of the adhesive layer is usually in the range of 2 to 4 Å μηι, preferably in the range of 5 to 3 0 μ: ηι. The bonding surface of the transparent resin film 1〇7 and/or the light diffusion layer 106 may be subjected to a corona discharge treatment or a primer treatment (formation of an undercoat layer), etc., before being bonded by an adhesive ( Adhesion improving treatment). (Protective film) As shown in Fig. 1, the light-diffusing polarizing plate of the present invention may further comprise a protective film 109 which is laminated on the opposite side of the light-diffusing film 1〇2 via the adhesive layer or the like. The film 109 is preferably a film of a polymer which is low in birefringence and excellent in transparency or mechanical strength, thermal stability or water repellency. As the film, for example, a cellulose acetate resin such as TAC (triacetyl cellulose), a fluorine resin such as an acrylic resin, a Japanese ethylene/hexa-propylene copolymer, or a polycarbonate resin can be used. Ethylene terephthalate, etc. «Resin, polyimide resin, polysulfone resin, poly" resin polystyrene resin, polyethylene (10) resin, polyvinyl chloride resin 'polycarbonate (4) Tree of lipid or polyamine resin (4). In the above aspects, in terms of polarization characteristics, durability, etc., it is preferred to use a triethylenesulfonated cellulose film or a norbornene-based thermoplastic tree, such as a fluorene-based thermoplastic tree, which is resistant to thirst. Sex (resj. —t〇heat) is higher, so it can be 159068.doc •27- 201227007. It is the same as the durability of the polarizing plate, and because of its low hygroscopicity, it is more stable. Especially good. The resin can be used for the forming of the film; the method of the m-casting method m and the previously known method of the extrusion method, and the thickness of the protective film 109 is not particularly limited to the viewpoint of thinning of the polarizing plate, etc. 3 is preferable. The range of 500 μm or less, more preferably 5 to 3 Å () μηι, and further preferably 5 to 150 μπι. The bonding of the polarizing film 101 and the protective film 1 to 9 using an adhesive can be carried out by the same method as the above-mentioned bonding agent with respect to the bonding of the surface treatment film 103 and the light diffusion film 1〇2. In the polarizing film 101, an optical compensation film such as a retardation film (phase difference plate) may be bonded in place of the protective film 109. The light-diffusing polarizing plate having the above-described configuration is typically applied to a liquid crystal display device, and is formed by adhering the surface treatment film i 〇 3 to the glass substrate of the liquid crystal cell via an adhesive layer or the like so that the surface treatment film i 〇 3 becomes the viewing side. In a liquid crystal display device. <Liquid Crystal Display Device> Next, the liquid crystal display device of the present invention will be described. The liquid crystal display device of the present invention comprises, in order, a backlight device, a light diffusing mechanism, a backlight-side polarizing plate, a liquid crystal cell, and the above-described light diffusing polarizing plate of the present invention. Fig. 3 is a schematic cross-sectional view showing a preferred example of the liquid crystal display device of the present invention. The liquid crystal display device 4 of FIG. 3 is a TN-type liquid crystal display device in a norrnally white mode, and the backlight device 402, the light diffusing mechanism 403, the backlight-side polarizing plate 404, and the like are sequentially disposed. A liquid crystal 151068.doc is provided for the liquid crystal layer 412 between the transparent substrates 411a and 411b.

201227007 401, and a light diffusing polarizing plate 405 of the present invention as a viewing side polarizing plate. The backlight-side polarizing plate 404 and the light-diffusing polarizing plate 4〇5 are arranged such that the transmission axes of the four are in the relationship of crossed nicols. The backlight unit 402 is a direct type backlight unit including a rectangular parallelepiped casing 421 having an open upper surface and a plurality of cold cathode tubes 422 as linear light sources arranged in parallel in the casing 421. Further, the light diffusing means 403 includes a light diffusing plate 4?3a disposed on the backlight device 402, and a light deflecting plate provided on the front surface side of the light diffusing plate 403a (between the light diffusing plate 403a and the backlight side polarizing plate 404)稜鏡 )) 403b. In the liquid crystal display device 400 of this configuration, the light emitted from the backlight device 402 is diffused by the light diffusing plate 403a of the light diffusing means 403, and is then provided to the light incident surface of the liquid crystal cell 4?1 by the light deflecting plate 403b. The directionality of the normal direction of the normal direction. The directivity to the normal direction is set higher than the previous device. And the light which is imparted with a specific directivity by the backlight-side polarizing plate 404 and which is incident on the liquid crystal cell 4 is incident on the liquid crystal cell 401, is controlled by the liquid crystal layer 412, and is controlled from the liquid crystal cell 4 1 Exit. Further, the light emitted from the liquid crystal cell 401 is diffused by the light diffusing polarizing plate 405. In the liquid crystal display device of the present invention, the directivity of the light diffusing mechanism 403 to the normal direction of the light incident on the liquid crystal cell 401 can be formed higher than that of the previous one, that is, more concentrated toward the liquid crystal cell 4 than before. The incident light of 1 is further diffused by the light diffusing polarizing plate 405. Thereby, excellent image quality such as color reproducibility can be obtained as compared with the prior art. 159068.doc -29-201227007 Further, the liquid crystal display device of the present invention to which the light diffusing polarizing plate of the present invention is applied has a high viewing angle characteristic and has other optical functions for imparting a light diffusing polarizing plate, and visibility Excellent. Hereinafter, constituent members constituting the liquid crystal display device of the present invention will be described in more detail. (Liquid Crystal Cell) The liquid crystal cell 401 includes a pair of transparent substrates 411a and 411b disposed oppositely by a spacer by a predetermined distance, and a liquid crystal layer 412 formed by filling a liquid crystal between the pair of transparent substrates 4Ua and 41b. . A transparent electrode or an alignment film is laminated on each of the pair of transparent substrates 411a and 411b, and a voltage based on the display material is applied between the transparent electrodes to align the liquid crystal. The display mode of the liquid crystal cell 401 is the TN mode in the above example, and the display mode such as the ips mode or the VA mode may be used. (Backlight Device) The backlight device 402 includes a rectangular parallelepiped casing 421 having an open upper surface, and a cold cathode tube 422 as a linear light source arranged in parallel in the casing 421. The casing 421 is formed of a resin material or a metal material. In view of the fact that the light radiated from the cold cathode 422 is reflected on the inner peripheral surface of the casing 421, it is preferable that at least the inner circumferential surface of the casing 421 is white or silver. As the light source, in addition to the cold cathode tube, a variety of shapes such as a linear shape or the like can be used. In the case of using a linear light source, the number of linear light sources to be arranged is not particularly limited. From the viewpoint of suppressing uneven brightness of the light-emitting surface, it is preferable that the distance between the centers of the adjacent linear light sources is 15 111111 to 15 〇 mm range. Furthermore, the backlight device 4〇2 used in the present invention is not limited to the direct type shown in FIG. 3, 159068.doc • 30·201227007, and the side of the light guide plate may be disposed on the side of the linear light source or the point light source. Various types such as a side light type or a planar light source type. [Light Diffusion Mechanism] As shown in FIG. 4, the light diffusion mechanism 403 preferably includes a light diffusion plate 403a disposed on the backlight device 402 and a front surface side of the light diffusion plate 4〇3a (the light diffusion plate 403a and the light diffusion plate 403a) The light between the backlight-side polarizing plates 404 is deflected toward the plate (prism sheet) 403b. The light diffusing plate 403a may be a film or sheet in which the light diffusing agent 440 is dispersed and mixed in the substrate 430, as shown in Fig. 4, for example. As the substrate 430', a polycarbonate resin, a methacrylic resin, a methyl methacrylate-styrene copolymer resin, an acrylonitrile-styrene copolymer resin, a methacrylic acid-styrene copolymer resin can be used. Polystyrene-based sapphire, polyvinyl chloride resin, polyolefin resin such as polypropylene or polymethylpentene, cyclic polyolefin resin, polyethylene terephthalate or polyethylene terephthalate A polyester resin such as butylenedicarboxylate or polyethylene naphthalate, a polyamine resin, a polyarylate resin, and a polyimide resin. In addition, the light-diffusing agent 44 混合 which is mixed and dispersed in the base material 430 is not particularly limited as long as it is a material containing a material having a refractive index different from that of the material of the base material 430, and may be, for example, different from the material to be the base material 430. Organic microparticles such as acrylic resin, melamine resin, polyethylene resin, polystyrene resin, organic polyoxyn resin, and acrylic acid-styrene copolymer resin, and carbon-oxygen, oxidized, cesium carbonate, sulfuric acid Inorganic fine particles such as bismuth, titanium oxide and glass. The light diffusing agent 440 to be used may be used alone or in combination of two or more. Further, organic polymerization 159068.doc -31·201227007 The balloon or the hollow glass beads can also be used as a light diffusing agent 44〇. The average particle size of the light diffusing agent 440 is preferably in the range of 〇5~3 〇. Further, the light diffusing agent 440 may have a spherical shape, a flat shape, a plate shape, a needle shape, or the like, and is preferably spherical. On the other hand, the light deflecting plate (prism sheet) 403b is formed on the light incident surface side (the backlight device 4〇2 side) as a flat surface and is formed in parallel on the light emitting side surface (the surface facing the backlight side polarizing plate 404). The plurality of cross-sections have a polygonal shape with a pointed tip, preferably a triangular shape of a linear shape. Examples of the material of the light deflecting plate 403b include a polycarbonate resin, an abs (Acrylonitrile-Butadiene-Styrene, acrylonitrile-butadiene-styrene) resin, a methacrylic resin, and a methyl methacrylate- A styrene copolymer tree, a polystyrene resin, an acrylonitrile-styrene copolymer resin, and a polyolefin resin such as polyethylene or polypropylene. As a method of producing the optical deflecting plate 4〇3b, a molding method of a usual thermoplastic resin can be used, and examples thereof include hot press forming using a die, extrusion molding, and the like. The thickness of the light deflecting plate 4〇3b is usually 0.1-15 mm', preferably 0.5-10 mm. The light diffusing plate 403a and the light deflecting plate 403b may be integrally formed, or may be joined after being separately produced. Further, in the case of separately producing and joining, the light diffusing plate 403a and the light deflecting plate 403b can be brought into contact via the air layer. Further, the light diffusing plate 403a and the light deflecting plate 403b may be disposed apart from each other. As shown in Fig. 5, the light diffusing means 403 may be provided with a light diffusing function by dispersing and mixing the light diffusing agent 440 in the light deflecting plate 403b which functions as a light deflecting function. Further, as shown in Fig. 6, the light diffusing means 403 may be a two-piece optical deflecting plate (strip) which is disposed on the front side of the light diffusing plate 403a of I59068.doc - 32 - 201227007. In this case, referring to FIG. 6, it is preferable that the light deflecting plate 403b disposed on the side close to the light diffusing plate 4〇3a is substantially transmissive to the backlight side polarizing plate 404 in the direction of the ridge line 451 of the linear prism 450. The axial direction is arranged in parallel, and the light is disposed on the front side of the light deflecting plate 403b, and is substantially opposite to the light diffusing polarizing plate 4 in the direction of the ridge line 45Γ of the linear line 45 0'. The transmission axis direction of 〇5 is arranged in parallel. With this configuration, the brightness in the front direction of the liquid crystal display device can be further improved. However, the direction of the ridge line 451 of the linear enthalpy 450 may be substantially parallel to the transmission axis direction of the backlight-side polarizing plate 404, and may be linearly deflected by the light-biasing plate 403b. The direction of the ridge line 451 of the crucible 450 is substantially parallel to the transmission axis direction of the light diffusing polarizing plate 405. The light of the 迺 迺 迺 403 403 ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ ～ The luminance value in the direction is 20% or less with respect to the front luminance value, that is, the normal direction of the light incident surface of the liquid crystal cell 4〇1, and the emission from the light diffusion mechanism 4() 3 includes non-parallel light. A better light distribution characteristic is that there is no more than 6 法 normal to the light incident surface of the liquid crystal single body 401. Light. As shown in Fig. 3, the back surface of the light diffusing means 403 and the light incident surface of the liquid crystal cell are arranged in parallel, so that the line with respect to the light incident surface of the liquid crystal cell 4? is 70. The luminance value of the direction, and the illusion value are, for example, as shown in Fig. 7, when the length direction of the optical mechanism 403 is the \ direction, the back of the light diffusing means 1 and the 'facial plane' are Xy planes, The normal to the face is ^70. The brightness value of the direction is preferably the angle formed by the angle between the zigzag and the z-axis. 159068.doc •33· 201227007 The brightness value in the direction of 70. In order to set the above-described light distribution characteristics, for example, the shape of the linear prism 45 (and/or the linear shape 450') of the cross-sectional triangular shape of the light deflecting plate 403b may be adjusted. The linear shape is 45 〇, 45 〇, and the apex angle is preferably in the range of 60 to 12 ,, more preferably 9 〇 to 11 参照, with reference to Figs. 4 and 5). . The shape of the triangle is an equilateral or unequal shape, and is preferably an isosceles shape when it is intended to converge to the normal direction of the liquid crystal cell 4〇1 (the front direction of the liquid crystal display device). Further, it is preferable that the side surface including the linear ridges is formed so as to be arranged in such a manner that the base edges opposite to the apex angles of the ridges are adjacent to each other, and the plurality of linear ridges are substantially parallel to each other. In this case, as long as the condensing ability does not significantly decrease, the V-shaped groove formed by the apex of the linear ridge and the adjacent linear ridge may have a curved shape. The distance of the ridge line of the linear ridge (the distance d shown in Fig. 4 and Fig. 5) is usually in the range of 10 μm to 500, preferably in the range of 3 〇 〜 2 〇〇 2 。. As shown in Fig. 8, the term "non-parallel light" refers to light emitted from a circle having a diameter i cm out of the exit surface of the light diffusing means 4?3 as a direction from the normal direction of the exit surface by 1 m. When viewed from a projection image in a plane parallel to the observation surface, the light having the minimum half-value width of the in-plane luminance distribution of the projection image is an emission characteristic of 3 〇 cm or more. (Backlight Side Polarizing Plate) As the backlight side polarizing plate 404, a protective film can be generally applied to one surface or both surfaces of a polarizing film. As the polarizing film and the protective tape, those described above with respect to the light diffusing polarizing plate can be used. (Phase Difference Plate) As shown in Fig. 9, the liquid crystal display device of the present invention may comprise a phase difference plate 159068.doc

• 34 · 201227007 Medium phase difference plate 406 configuration

The difference plate 406 can be disposed on the backlight side polarizing plate 404 and the liquid crystal display 6'> The liquid crystal display device 4 shown in FIG. 9 is disposed on the backlight side polarizing plate 404 and the liquid crystal cell 4?1 with respect to the liquid crystal cell 401. The surface is zero, and one of the between the unit 4 401, or between the light diffusing polarizing plate 4〇5 and the liquid crystal cell 4〇, or both, is not generated from the front. The phase difference plate 4〇6 may be laminated on the protective film of the backlight-side polarizing plate 4〇4, or may be directly laminated on the polarizing film to function as a protective film. The same applies to the light diffusing polarizing plate 4〇5. The retardation film 406 is, for example, a film made of a polycarbonate resin or a cyclic olefin polymer resin, or a biaxially stretched film, or a liquid crystal monomer coated on the film. The photopolymerization reaction causes the molecular arrangement to be immobilized. Since the phase difference plate 4〇6 optically compensates the arrangement of the liquid crystals, the refractive index characteristics opposite to the liquid crystal alignment are used. Specifically, in the liquid crystal cell of the TN mode, for example, "WV Film" (manufactured by Fuji Film Co., Ltd.) can be preferably used, and in the liquid crystal display unit of the STN mode, for example, r lc film can be preferably used. (manufactured by Shin Sakamoto Co., Ltd.), in the liquid crystal display unit of the IPS mode, for example, a biaxial retardation film can be preferably used, and in the liquid crystal display unit of the VA mode, for example, a combination A can be preferably used. For the liquid crystal display unit of the π unit mode, for example, the "VB film for OCB" can be preferably used in the liquid crystal display unit of the π unit mode (Fuji Film Co., Ltd. 159068.doc -35) · 201227007 made) and so on. [Examples] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the examples. Further, the haze of the light diffusing film and the center line average roughness Ra of the surface in the following examples, the thickness of the light diffusing layer, and the weight average particle diameter of the light transmitting fine particles used in the light diffusing layer, and the storage of the adhesive layer The method of measuring the elastic modulus and the surface hardness of the surface of the surface treated film (surface of the surface treated layer) is as follows.雾) Haze The measurement sample was prepared by bonding the transparent substrate film side of the light diffusion film to the glass substrate using an optically transparent adhesive. The measurement of the haze was carried out using the sample for measurement. For the measurement of the total haze value and the internal haze, a haze penetration meter according to JIS K 7136 (a haze meter "HM-150" manufactured by Murakami Color Technology Research Co., Ltd.) is used according to the result and (3) The surface haze is calculated. (b) The center line average roughness Ra is measured using a conjugate focal length interference microscope (for example, "ρ]^μ23〇〇 manufactured by 〇pUcal Solution Co., Ltd.) according to JIS B 0601. The center line average roughness Ra of the surface of the light diffusion layer of the light diffusion film was calculated according to the above formula (1). (The thickness of the light diffusion layer is DIGIMICRO MH-15 (body) manufactured by NIKON Co., Ltd. and ZC-101 (the number of juices) The thickness of the light-diffusing film was measured by subtracting the thickness (80 μm) of the transparent substrate film from the measured layer thickness, thereby measuring the thickness of the light-diffusing layer. 159068.doc • 36·

S 201227007 (d) Standard deviation of weight average particle diameter and particle diameter of light-transmitting fine particles The Coulter particle counter (manufactured by Beckman Coulter Co., Ltd.) was used for measurement according to the Coulter principle (fine pore resistance method). (e) Storage elastic modulus of the adhesive layer (25 °C) A cylindrical n-sheet of 8 mm x thickness 包含 containing the adhesive was prepared for the measurement object, using a dynamic viscoelasticity measuring device RDa II : RE〇METRIC Limited The company manufactured) was measured by a torsional shearing method. The measurement conditions were set to a frequency of 1 Hz, an initial strain of 1 N, and a temperature of 25 °C. (0) The pencil hardness of the surface of the surface treated film was measured according to JIS K 5600-5-4 (Pencil Scratch Test Method), and the scratch measurement was performed 5 times at a load of 5 〇〇g, and the case where the wound was not damaged twice or more was the most The hardness of the hard pencil is used as the hardness of the surface of the surface treatment film. The pencil hardness is measured before and after bonding the surface treatment film to the light diffusion film (the surface treatment film produced in each of the examples and the comparative examples is bonded) The hardness of the surface of the surface-treated film in the light-diffusing polarizing plate was performed. [Production of surface-treated film] (Production Example 1: Production of anti-glare film) Surface prepared for an iron roll (based on JIS STKM13A) having a diameter of 200 mm The method is applied to copper ballard plating. The heavy copper plating is composed of a steel plating layer/thin silver layer/surface key copper layer, and the thickness of the mineral coating layer is about 2 镜. The copper plating surface is mirror-polished. Further, using a spraying device (manufactured by Fuji Manufacturing Co., Ltd.), the injection pressure was 〇〇5 Mpa (gauge pressure, the same applies hereinafter), and the amount of fine particles used was 16 g/cm2 (the surface area of the roller per 1 159068.doc -37) · 201227007 cm2 usage 'below Under the same conditions, an oxidized wrong bead τζ-B125 (manufactured by Tosoh Co., Ltd., average particle diameter: 125 μm) was sprayed onto the polishing surface to form irregularities on the surface, using an injection device (manufactured by Fuji Manufacturing Co., Ltd.) The oxidized hammer TZ-SX-17 (average particle diameter: 20 μm manufactured by Tosoh Co., Ltd.) was sprayed onto the uneven surface under the conditions of a jet pressure of Oi MPa and a fine particle usage of 4 g/cm 2 . And finely adjusting the surface unevenness. The copper-plated iron roll with the unevenness obtained is etched by the copper chloride solution (etching amount: 3 μm). Thereafter, the chrome processing is performed (the plating layer is Thickness: 4 μm), a metal embossing roll is produced. The chrome surface of the obtained metal embossing roll has a Vickers hardness of 1 Å. The Vickers hardness is an ultrasonic hardness meter MIC10 (manufactured by Krautkramer). Measured according to JIS Z 2244. 60 parts by weight of pentaerythritol triacrylate and polyfunctional amino phthalate acrylate acid (reaction product of hexamethylene diisocyanate and pentaerythritol triacrylate) 40 parts by weight Bonded to a solution of propylene glycol monomethyl ether, the solid

The ultraviolet curable resin composition D is obtained by adjusting the concentration of the chemical component to 60% by weight, and then adding as a photopolymerization initiator to 100 parts by weight of the solid content of the ultraviolet curable resin composition. 5 parts by weight of Lucirin τρ〇 (manufactured by BASF Corporation, chemical name: 2,4,6-trimethylbenzylidene diphenylphosphine oxide), using propanol in such a manner that the solid content concentration is 6 〇% by weight. The coating liquid was prepared by diluting with a single test. The coating liquid was applied to a transparent resin film having a thickness of 80 as a triethyl cellulose (tac) film, and dried in a dryer set to 8 Qt (8). Points 159068.doc

201227007 clock. Then, the dried transparent resin film is pressed against the uneven surface of the metal embossing roll so as to be in close contact with each other so that the ultraviolet curable resin composition layer is on the roll side. In this state, light of a high-pressure mercury lamp having a strength of 20 mW/cm 2 is irradiated from the transparent resin film side so that the light is converted to 300 mj/cm 2 in the h-ray conversion, and the ultraviolet curable resin composition layer is cured. An anti-glare film having an anti-glare layer formed on the transparent resin film. The pencil hardness of the surface of the antiglare layer of the obtained antiglare film was 3H 〇 (Production Example 2: Preparation of antireflection film) 1 part by weight of dipentaerythritol triacrylate, 10 parts by weight of pentaerythritol tetraacrylate, and an amine group of acrylate 30 parts by weight of "IRGACURE 184" (manufactured by Ciba japan Co., Ltd.) as a photopolymerization initiator, 30 parts by weight of formic acid ester ("UA-306T" manufactured by Kyoeisha Chemical Co., Ltd.), and used as a solvent The coating liquid for forming a hard coat layer of the ultraviolet curable resin composition was prepared by mixing 5 parts by weight of methyl ethyl ketone and 5 parts by weight of butyl vinegar. This coating liquid was applied onto a transparent resin film (refractive index 149) as a TAC film by a bar coater, and dried in a dryer set to 80 C for 1 minute. Using a metal halide lamp, the dried transparent resin film is irradiated with ultraviolet rays for 1 second from a distance of 20 (10) at a distance of 20 (10) to form a hard coat layer. The thickness of the hard coat layer obtained is 5 Μιη, refractive index of 1.5 2 » Then 'Isopropanol, 〇in_ acid was added to the tetraethoxy mash, and hydrolysis was carried out, thereby obtaining a solution containing a tetraethoxy group containing an oligomer. In the solution, the mixed-minarized 4 tin (barium) microparticles with a secondary particle size of 8 nm were added with isopropyl alcohol, thereby obtaining a polymer containing tetraethoxy 159068.doc-39·201227007 The coating liquid for forming an antistatic layer of 25% by weight of the tin oxide fine particles of 4% by weight. On the other hand, the TAC film formed with the hard coat layer was placed in a 5 〇1·5 N-NaOH aqueous solution. The mixture was immersed for 2 minutes for alkali treatment, washed with water, and then immersed in a 5 wt% 2H2S 4 aqueous solution at room temperature for 30 seconds to be neutralized, further washed with water and dried. a bar coater for applying the above coating liquid for forming an antistatic layer onto an alkali treated hard coat layer And forming an antistatic layer by drying in a dryer set to 12 〇 < t to form an antistatic layer. The obtained antistatic layer has a thickness of 163 nm, a refractive index of L53, and an optical film thickness of 25 〇 nm. , obtained by adding isopropanol and 0.1 N hydrochloric acid to a mixture of tetraethoxy decane and hydrazine, 211, 2 fluorene perfluorooctyltrimethoxy decane of 95. 5 (mole ratio), followed by hydrolysis. a solution containing a polymer of an organic cerium compound containing an oligomer, which is mixed with a low refractive index cerium oxide microparticle having a void therein and added with isopropyl alcohol, thereby obtaining 2% by weight of the organic fluorene-containing substance, a coating liquid for forming a low refractive index layer having a low refractive index of cerium oxide fine particles of 2% by weight. The coating liquid for forming a low refractive index layer obtained is applied onto an antistatic layer by a wire bar coater. And drying in a dryer set to 120 C for a minute, thereby forming a low refractive index layer. The obtained low refractive index layer has a thickness of 91 nm, a refractive index of 丨3 7, and an optical film thickness of 125 nm. The above is prepared by including a hard coat layer on the transparent resin film, antistatic, Antireflection film of the refractive index layer of 16. The erroneous pen hardness of the surface of the low refractive index layer of the antireflection film obtained by the household is 2 Η. [Production of Light Diffusion Film] (Production Example 3: Production of Light Diffusion Film a) 159068 .doc 201227007 Mixing 60 parts by weight of pentaerythritol diacrylate and 40 parts by weight of polyfunctional urethane acrylate (reaction product of hexamethylene diisocyanate and pentaerythritol triacrylate) into propylene glycol monomethyl ether solution The ultraviolet curable resin composition is obtained by adjusting the solid content/agronomic degree to 60% by weight. Further, the propylene glycol single quilting is removed from the composition, and the external and external hardening is performed. The refractive index of the cured product is 1 · 5 3 β. Then, the weight average particle diameter of the i-th light-transmitting fine particles is 3.0 } x m and the standard deviation is 100 parts by weight of the solid content of the ultraviolet curable resin composition. 1 part by weight of the polystyrene-based particles of 〇·39 μιη, and 3 parts by weight of the polyethylene-based particles having a weight average particle diameter of 7.2 and a standard deviation of 0.73 μm as the second light-transmitting fine particles. And 5 parts by weight of "Lucirin ΤΡΟ" (manufactured by BASF Corporation, chemical name: 2'4,6-trimethylbenzimidyldiphenylphosphine oxide) as a photopolymerization initiator, and the solid content ratio is 60. The coating liquid was prepared by diluting with propylene glycol monomethyl ether in a weight % manner. This coating liquid was applied onto a film (transparent substrate film) having a thickness of 80 μm 2 : film and dried in a dryer set at 80 ° C for a minute, and then converted into light by h-ray from the side of the transparent substrate film. Light of a high-pressure mercury lamp having a strength of 2 〇 mW/cm 2 was irradiated to a thickness of 3 〇〇 mJ/cm 2 to cure the ultraviolet curable resin composition layer, thereby obtaining a light-diffusing film A including a light-diffusing layer and a transparent substrate film. The total haze, internal haze, and surface haze of the obtained light-diffusing film A were 6 (M%, 59.3%, 〇.8%, respectively. Further, the center line average thick chain degree Ra of the surface was 0.31 μιη. The thickness of the diffusion layer was 1 〇 5 μηη. 159068.doc -41 - 201227007 <Examples 1 to 3, Comparative Example ι> The surface of the transparent substrate film of the light-diffusing film A obtained in Production Example 3 was subjected to corona treatment. Thereafter, an ultraviolet curable adhesive containing an ultraviolet curable epoxy resin and a photocationic polymerization initiator was applied to the corona-treated surface at a thickness of 4 μm, and on the other hand, a TAC film (thickness) as a protective film. After the corona treatment was performed on one side of 8 μm), the same ultraviolet curable adhesive as described above was applied to the corona-treated surface at a thickness of 4 μm. Then, the uniaxially stretched polyethylene resin was applied. The light diffusion film A is laminated on one surface of the polarizing film on which the film is adsorbed and dispersed, and the protective film is laminated on the other surface via the adhesive layer, and a pair of the protective film is laminated on the other surface. The cooling roller is clamped to apply pressure. Thereafter, the self-protecting film side The ultraviolet ray was irradiated, and the adhesive layer on both sides was hardened to obtain a light-diffusing polarizing plate. Then, the anti-glare film obtained in Production Example 1 was passed through the sheet-like adhesive having the storage elastic modulus and thickness shown in Table 1. The light-diffusing polarizing plate of the light-diffusion film A in the light-diffusing polarizing plate is bonded to the light-diffusion layer of the light-diffusion polarizing plate in the transparent resin film side, and the light-diffusion polarizing plate which implements an anti-glare process is obtained. At the same time, the bubbles of the surface of the light-diffusing layer are mixed, and the results of the evaluation are shown in Table 1. Further, the pencil hardness of the surface of the anti-glare layer of the obtained light-diffusing polarizing plate subjected to anti-glare treatment is shown together. (Examples 4 to 6 and Comparative Example 2) Antireflection was carried out in the same manner as in Examples 1 to 3 and Comparative Example 1 except that the antireflection film obtained in Production Example 2 was used instead of the antiglare film. The evaluation results of the light diffusing polarizing plate treated with the bubble mixed are shown in Table 1. Further, 159068.doc • 42·201227007 The pencil of the surface of the low refractive index layer of the light diffusing polarizing plate which is subjected to the antireflection treatment is obtained. Hardness is shown together In Table 1. [Table 1] Laminated film-like adhesive on the light-diffusing layer. Pencil hardness is mixed with bubble storage elastic modulus (25 ° 〇 (MPa) thickness (μιη) Example 1 Anti-glare film 5.00 χ 104 25 Η No Example 2 3.7〇χ105 15 3Η No Example 3 3.7〇xl05 5 3Η No Comparative Example 1 1.00x106 25 3 Η Example 4 Antireflection Film 5.00χ104 25 Not reached Η No Example 5 3.7〇χ105 15 2Η [Example 6] 3.7 〇χ 105 5 2 Η No comparative example 2 Ι. ΟΟχΙΟ 6 25 2 Η [Brief description of the drawings] Fig. 1 is a schematic cross-sectional view showing a preferred example of the light diffusing polarizing plate of the present invention. Fig. 2 is a schematic view showing an example of an apparatus for manufacturing a light-diffusing film. Fig. 3 is a schematic cross-sectional view showing a preferred example of the liquid crystal display device of the present invention. Fig. 4 is a schematic cross-sectional view showing an example of a light diffusing mechanism. The cofferdam 5 is a schematic cross-sectional view showing another example of the light diffusing mechanism. Fig. 6 is a schematic perspective view for explaining the relationship between the ridge direction of the linear ridges included in the two optical deflecting plates (the cymbal) and the transmission axis direction of the polarizing plate. 0 159068.doc •43· 201227007 Fig. 7 An example of a method of measuring a luminance value in a direction of 70° with respect to a normal line of a light incident surface of a liquid crystal cell to a light diffusing means. Figure 8 is a diagram illustrating the definition of non-parallel light. Fig. 9 is a schematic cross-sectional view showing another preferred example of the liquid crystal display device of the present invention. [Description of main components] 100 light diffusing polarizing plate 101 polarizing film 102 light diffusing film 103 surface treating film 104 adhesive layer 105 transparent substrate film 106 light diffusing layer 106a light transmitting fine particles 106b light transmitting resin 107 transparent resin film 108 Surface treatment layer 109 Protective film 301 Unwinding device 302 Coating device 303 Support roller 304 Dryer 305 Mirror metal roll or metal for embossing 306 nip roll

159068.doc S 201227007 307 peeling roller 308 ultraviolet irradiation device 309 winding device 400 liquid crystal display device 400' liquid crystal display device 401 liquid crystal early element 402 backlight device 403 light diffusing mechanism 403a light diffusing plate 403b light deflecting plate 403b' light deflecting plate 404 Backlight side polarizing plate 405 Light diffusing polarizing plate 406 Phase difference plate 411a Transparent substrate 411b Transparent substrate 412 Liquid crystal layer 421 Case 422 Cold cathode tube 43 0 Substrate 440 Light diffusing agent 4: 50 Linear prism 450' Linear prism 451 ridge ridge ridge 451' linear ridge ridge 159068.doc: • 45·

Claims (1)

201227007 VII. Patent application scope: 1. A light diffusing polarizing plate comprising: a polarizing film; a light diffusing film laminated on the polarizing film; and a surface treating film laminated on the light diffusing film; and the light diffusing The film includes a light-diffusion layer having a center line average roughness of the surface of 表面 J J J1111 and less than 1 μηι; the surface treatment film is a transparent resin film having an optical treatment on one surface; light of the light diffusion film The diffusion layer and the above surface treatment film pass through 25. The adhesive layer having a storage elastic modulus of less than 1〇xl〇6 pa is attached to each other. 2. The light diffusing polarizing plate of claim 1, wherein the storage elastic modulus of the adhesive layer at 25 C is i 〇 xi 〇 5 Pa or more. 3. The light-diffusing polarizing plate according to claim 1, wherein the light-diffusing layer and the surface of the surface-treated film opposite to the surface on which the optical treatment is applied are bonded to each other via the adhesive layer. 4. The light diffusing polarizing plate according to item 1, wherein the surface treatment film is an anti-glare film which is subjected to an anti-glare treatment on one of the surfaces of the transparent resin film, or an anti-reflection treatment is performed on one surface of the transparent resin film. Anti-reflective film. 5. The light diffusing polarizing plate of claim 1, wherein the light diffusing film comprises a transparent base film and the light diffusing layer laminated on the transparent base film, and 159068.doc 201227007 A photo-resin and a translucent fine particle dispersed in the translucent resin. 6. The light diffusing polarizing plate of claim 5, wherein the light diffusing layer is formed by applying a resin liquid in which the light transmitting fine particles are dispersed to the transparent base film. 7. The light-diffusing polarizing plate of claim 5, wherein the light-diffusing layer is a surface of a layer containing the resin liquid after the resin liquid in which the light-transmitting fine particles are dispersed is applied onto the transparent base film The mirror surface or the uneven surface of the transfer mold is formed. 8. A liquid crystal display device in which a backlight device, a light diffusing mechanism, a backlight side polarizing plate, a liquid crystal cell, and a light diffusing polarizing plate according to any one of claims 7 to 7 are laminated in this order, and the light diffusing is performed The polarizing plate is disposed such that the polarizing film side faces the liquid crystal cell. 9. The liquid crystal display device of claim 8, wherein the emitted light from the light diffusing means has a brightness in a direction inclined by 7 〇 from a normal direction of a light incident surface of the liquid crystal cell with respect to a brightness in the normal direction 2配% or less of light distribution characteristics, and includes non-parallel light. 10. The liquid crystal display device of claim 8, wherein the light diffusing means comprises a light diffusing plate on the side of the backlight device and a light deflecting plate on a side opposite to the backlight device with respect to the light diffusing plate. i π is the liquid 曰 $ display device of item 8 wherein the liquid crystal cell is a liquid liquid cell, an IPS mode liquid crystal cell or a VA mode liquid crystal cell.